The present watt balance: a measure of its resolution

Abstract

It was possible to operate the watt balance in the normal mode, but with the magnetic field reduced by more than six orders of magnitude. This mode of operation allowed the investigation of possible sources of systematic errors not specifically connected with the magnetic field, but rather with the balance environment. This measurement revealed a general lack of environmental effects and indicated an upper limit of resolution less than thirty parts per billion for a potential watt evaluation.<>